Soft Colour Interactions and Diffractive DIS

The basic ideas and some results of the semiclassical approach to diffractive DIS are briefly described. In the production of high-$p_{\perp }$ jets boson-gluon fusion is predicted to be the dominant partonic process. The $p_{\perp }$-spectrum and the two-jet invariant mass distribution provide a clear test of the underlying hard' partonic process and the soft’ mechanism of colour neutralization.